Data Collectionmedium
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A researcher wants to investigate whether a dietary supplement reduces risk of cardiovascular disease. She has two design options:
Design A (Cohort): Recruit 2,000 people currently taking the supplement and 2,000 who don't. Follow both groups for 5 years and measure the proportion in each group who develop cardiovascular disease.
Design B (Case-Control): Identify 300 people recently diagnosed with cardiovascular disease (cases) and 300 without it (controls). Ask all 600 people about their past supplement usage.
Which statement best compares these two study designs?
A researcher wants to investigate whether a dietary supplement reduces risk of cardiovascular disease. She has two design options:
Design A (Cohort): Recruit 2,000 people currently taking the supplement and 2,000 who don't. Follow both groups for 5 years and measure the proportion in each group who develop cardiovascular disease.
Design B (Case-Control): Identify 300 people recently diagnosed with cardiovascular disease (cases) and 300 without it (controls). Ask all 600 people about their past supplement usage.
Which statement best compares these two study designs?